Title :
Ultra fast pilot protection of a looped distribution system
Author :
Thirumalai, A. ; Liu, Xindong ; Karady, G.G.
Author_Institution :
Electr. Eng., Nat. Inst. of Technol., Durgapur, India
Abstract :
The distribution system considered in this work is the FREEDM* loop. The loop is divided into different zones for protection. A fast pilot protection scheme is proposed for this looped system. The scheme makes time synchronized measurements of line currents, converts them to digital word. Time synchronization is added using a GPS. This time-synchronized digital word is transmitted to a computer, which executes a protection strategy for differential protection as primary and overcurrent protection as backup based on the requirements of the FREEDM system. A trip signal generated by this strategy is sent to the breaker to trip the line to complete the experimental setup. Since the protection algorithm is based on digital signals, this scheme is much faster than a conventional differential pilot protection algorithm.
Keywords :
Global Positioning System; power distribution protection; FREEDM loop system; GPS; Global Positioning System; differential pilot protection algorithm; digital signals; line current time synchronized measurement; looped distribution system; ultrafast pilot protection scheme; Circuit faults; Current transformers; Data acquisition; Microcontrollers; Relays; Switches; Synchronization; Analog-digital conversion; Data acquisition; Digital systems; Fault detection; Intelligent systems; Microcontrollers; Power distribution faults; Power system protection; Smart grids; Wide area measurements;
Conference_Titel :
PowerTech, 2011 IEEE Trondheim
Conference_Location :
Trondheim
Print_ISBN :
978-1-4244-8419-5
Electronic_ISBN :
978-1-4244-8417-1
DOI :
10.1109/PTC.2011.6019216
